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【单选题】
______文件是根据MPEG-1视频压缩标准中,对立体声伴音进行三层压缩的方法所得到的声音文件。A.
JPG
B.
MP3
C.
MID
D.
WAV
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【单选题】听力原文： America's national symbol—the Bald Eagle—almost went extinct 20 years ago. But it has made a comeback In fact, the US Fish and Wildlife Service is considering the possibility of taking it off th...
A.
It limited their supply of food.
B.
It made their eggshells too fragile.
C.
It destroyed many of their nests.
D.
It killed many baby bald eagles.